如何使角度材料步进下一步，即使它绑定到的形式是无效的

<mat-step [stepControl]="firstForm">
  <form [formGroup]="firstForm">
    <!-- 表单内容 -->
    <button mat-button (click)="nextStep()" [disabled]="!firstForm.valid">Next</button>
  </form>
</mat-step>

<mat-step [stepControl]="secondForm">
  <form [formGroup]="secondForm">
    <!-- 表单内容 -->
    <button mat-button (click)="submitForm()">Submit</button>
  </form>
</mat-step>

import { Component } from '@angular/core';
import { FormBuilder, FormGroup, Validators } from '@angular/forms';

@Component({
  selector: 'app-multi-step-form',
  templateUrl: './multi-step-form.component.html',
  styleUrls: ['./multi-step-form.component.css']
})
export class MultiStepFormComponent {
  firstForm: FormGroup;
  secondForm: FormGroup;

  constructor(private fb: FormBuilder) {
    this.firstForm = this.fb.group({
      name: ['', Validators.required],
      email: ['', [Validators.required, Validators.email]]
    });

    this.secondForm = this.fb.group({
      address: ['', Validators.required]
    });
  }

  nextStep() {
    // 即使firstForm无效，也允许进入下一步
    // 这里可以添加逻辑来处理无效表单的情况
  }

  submitForm() {
    if (this.firstForm.valid && this.secondForm.valid) {
      // 提交表单
    } else {
      // 处理表单无效的情况
    }
  }
}